Upper End Components Inspection And Servicing - HYOSUNG GF125 Service Manual

3-11 SERVICING ENGINE
UPPER END COMPONENTS INSPECTION
AND SERVICING
CAMSHAFT HOLDER DISTORTION
After removing oil from the fitting surface of the camshaft
holder, place the camshaft holder on a surface plate and
check for distortion with a thickness gauge. Check points
are shown in Fig.
Service limit
ROCKER ARM SHAFT O.D.
Measure diameter of rocker arm shaft.
Standard
ROCKER ARM I.D.
When checking the valve rocker arm, the inside diameter
of the valve rocker arm and wear of the camshaft con-
tacting surface should be checked.
Standard
CAMSHAFT
The camshaft should be checked for runout and also for
wear of cams and journals if the engine has been noted
to produce abnormal noise or vibration or a lack of output
power. Any of these malconditions could be caused by a
worn camshaft.
0.05㎜
11.977~11.955㎜
12.000~12.018㎜
(T.D.C)
Inlet open
(B.T.D.C)
38。 37。
52。
Inlet close
(A.B.D.C)
(B.D.C)
Valve timing diagram
Exhaust close
(A.T.D.C)
Exhaust open
65。
(B.B.D.C)